Aaron Cook‘s rehab assignment for a broken finger was scheduled to consist of three starts, but instead he’s already pitched four times and Thomas Harding of MLB.com reports that the Rockies “have asked” him to make at least one more start at Triple-A.

Barring any further changes Cook is on track to rejoin the Rockies’ rotation on June 8 against the Padres, which would be his first game action in the majors since September 8 of last year.

Jim Tracy told Harding that the Rockies want Cook to increase his stamina, but his arm must be pretty well stretched out given that he threw 99 pitches Sunday. The bigger issue would seemingly be the six runs he allowed in 7.2 innings against Triple-A hitters.